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<div class="title">src/ca/uqac/dim/turtledb/Union.java</div>  </div>
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<a href="_union_8java.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*-------------------------------------------------------------------------</span>
<a name="l00002"></a>00002 <span class="comment">    Simple distributed database engine</span>
<a name="l00003"></a>00003 <span class="comment">    Copyright (C) 2012  Sylvain Hallé</span>
<a name="l00004"></a>00004 <span class="comment"></span>
<a name="l00005"></a>00005 <span class="comment">    This program is free software: you can redistribute it and/or modify</span>
<a name="l00006"></a>00006 <span class="comment">    it under the terms of the GNU General Public License as published by</span>
<a name="l00007"></a>00007 <span class="comment">    the Free Software Foundation, either version 3 of the License, or</span>
<a name="l00008"></a>00008 <span class="comment">    (at your option) any later version.</span>
<a name="l00009"></a>00009 <span class="comment"></span>
<a name="l00010"></a>00010 <span class="comment">    This program is distributed in the hope that it will be useful,</span>
<a name="l00011"></a>00011 <span class="comment">    but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<a name="l00012"></a>00012 <span class="comment">    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the</span>
<a name="l00013"></a>00013 <span class="comment">    GNU General Public License for more details.</span>
<a name="l00014"></a>00014 <span class="comment"></span>
<a name="l00015"></a>00015 <span class="comment">    You should have received a copy of the GNU General Public License</span>
<a name="l00016"></a>00016 <span class="comment">    along with this program.  If not, see &lt;http://www.gnu.org/licenses/&gt;.</span>
<a name="l00017"></a>00017 <span class="comment"> -------------------------------------------------------------------------*/</span>
<a name="l00018"></a>00018 <span class="keyword">package </span>ca.uqac.dim.turtledb;
<a name="l00019"></a>00019 
<a name="l00020"></a>00020 <span class="keyword">import</span> ca.uqac.dim.turtledb.QueryVisitor.VisitorException;
<a name="l00021"></a>00021 
<a name="l00028"></a><a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_union.html">00028</a> <span class="keyword">public</span> <span class="keyword">class </span><a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_union.html">Union</a> <span class="keyword">extends</span> <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_n_ary_relation.html">NAryRelation</a>
<a name="l00029"></a>00029 {   
<a name="l00030"></a>00030 
<a name="l00031"></a>00031   @Override
<a name="l00032"></a><a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_union.html#a6878967d4cf481b22cf0342bf3cdec1b">00032</a>   <span class="keyword">public</span> <span class="keywordtype">void</span> <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_union.html#a6878967d4cf481b22cf0342bf3cdec1b">accept</a>(<a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_query_visitor.html">QueryVisitor</a> v) <span class="keywordflow">throws</span> <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_query_visitor_1_1_visitor_exception.html">VisitorException</a>
<a name="l00033"></a>00033   {
<a name="l00034"></a>00034     super.acceptNAry(v);
<a name="l00035"></a>00035     v.visit(<span class="keyword">this</span>);
<a name="l00036"></a>00036   }
<a name="l00037"></a>00037 
<a name="l00038"></a><a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_union_1_1_union_stream_iterator.html">00038</a>   <span class="keyword">protected</span> <span class="keyword">class </span><a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_union_1_1_union_stream_iterator.html">UnionStreamIterator</a> <span class="keyword">extends</span> NAryRelationStreamIterator
<a name="l00039"></a>00039   {
<a name="l00040"></a><a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_union_1_1_union_stream_iterator.html#a28f9411b276c2dde8e48ce87154a54a4">00040</a>     <span class="keyword">public</span> <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_union_1_1_union_stream_iterator.html#a28f9411b276c2dde8e48ce87154a54a4">UnionStreamIterator</a>()
<a name="l00041"></a>00041     {
<a name="l00042"></a>00042       super();
<a name="l00043"></a>00043     }
<a name="l00044"></a>00044     
<a name="l00045"></a>00045     @Override
<a name="l00046"></a><a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_union_1_1_union_stream_iterator.html#aacc6d07ad50c9d15dea3e2b709b75d15">00046</a>     <span class="keyword">protected</span> <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_tuple.html">Tuple</a> <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_union_1_1_union_stream_iterator.html#aacc6d07ad50c9d15dea3e2b709b75d15">internalNext</a>()
<a name="l00047"></a>00047     {
<a name="l00048"></a>00048       super.initializeIteration();
<a name="l00049"></a>00049       <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_relation.html">Relation</a> r = <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_n_ary_relation.html#aed20a0eb0271434efde6557d9d1064f9">m_relations</a>.get(0);
<a name="l00050"></a>00050       <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_schema.html">Schema</a> sch = r.<a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_relation.html#a7a7af53642133603e51e04d79f938286">getSchema</a>();
<a name="l00051"></a>00051       <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_tuple.html">Tuple</a> t = super.incrementSmallestTuple();
<a name="l00052"></a>00052       <span class="keywordflow">if</span> (t == null)
<a name="l00053"></a>00053         <span class="keywordflow">return</span> null;
<a name="l00054"></a>00054       <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_tuple.html">Tuple</a> t2 = <span class="keyword">new</span> <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_tuple.html">Tuple</a>(t);
<a name="l00055"></a>00055       t2.<a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_tuple.html#a846cbb8b648465c78633cc623caec4ee">setSchema</a>(sch);
<a name="l00056"></a>00056       <span class="keywordflow">return</span> t2;
<a name="l00057"></a>00057     }
<a name="l00058"></a>00058   }
<a name="l00059"></a>00059 
<a name="l00060"></a>00060   @Override
<a name="l00061"></a><a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_union.html#afb3b1ad311fbe6d366904629bcf57d9e">00061</a>   <span class="keyword">public</span> <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_relation_stream_iterator.html">RelationStreamIterator</a> <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_union.html#afb3b1ad311fbe6d366904629bcf57d9e">streamIterator</a>()
<a name="l00062"></a>00062   {
<a name="l00063"></a>00063     <span class="keywordflow">return</span> <span class="keyword">new</span> <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_union_1_1_union_stream_iterator.html">UnionStreamIterator</a>();
<a name="l00064"></a>00064   }
<a name="l00065"></a>00065 
<a name="l00066"></a>00066   @Override
<a name="l00067"></a><a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_union.html#a3fdb4a9b8ce9310f87df22db43c123db">00067</a>   <span class="keyword">public</span> <a class="code" href="interfaceca_1_1uqac_1_1dim_1_1turtledb_1_1_relation_iterator.html">RelationIterator</a> <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_union.html#a3fdb4a9b8ce9310f87df22db43c123db">cacheIterator</a>()
<a name="l00068"></a>00068   {
<a name="l00069"></a>00069     <span class="keywordflow">return</span> <span class="keyword">new</span> <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_union_1_1_union_cache_iterator.html">UnionCacheIterator</a>();
<a name="l00070"></a>00070   }
<a name="l00071"></a>00071   
<a name="l00072"></a><a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_union_1_1_union_cache_iterator.html">00072</a>   <span class="keyword">protected</span> <span class="keyword">class </span><a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_union_1_1_union_cache_iterator.html">UnionCacheIterator</a> <span class="keyword">extends</span> <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_relation_cache_iterator.html">RelationCacheIterator</a>
<a name="l00073"></a>00073   {
<a name="l00074"></a>00074     @Override
<a name="l00075"></a><a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_union_1_1_union_cache_iterator.html#adc8e20a5270643f64e26e61ca72a9f2e">00075</a>     <span class="keyword">protected</span> <span class="keywordtype">void</span> <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_union_1_1_union_cache_iterator.html#adc8e20a5270643f64e26e61ca72a9f2e">getIntermediateResult</a>()
<a name="l00076"></a>00076     {
<a name="l00077"></a>00077       <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_schema.html">Schema</a> sch = <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_n_ary_relation.html#a7fa39c21e49765163cdb930d398f0826">getSchema</a>();
<a name="l00078"></a>00078       <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_table.html">Table</a> tab = <span class="keyword">new</span> <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_table.html">Table</a>(<a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_n_ary_relation.html#a7fa39c21e49765163cdb930d398f0826">getSchema</a>());
<a name="l00079"></a>00079       <span class="keywordflow">for</span> (<a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_relation.html">Relation</a> r : <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_n_ary_relation.html#aed20a0eb0271434efde6557d9d1064f9">m_relations</a>)
<a name="l00080"></a>00080       {
<a name="l00081"></a>00081         <a class="code" href="interfaceca_1_1uqac_1_1dim_1_1turtledb_1_1_relation_iterator.html">RelationIterator</a> i = r.cacheIterator();
<a name="l00082"></a>00082         <span class="keywordflow">while</span> (i.hasNext())
<a name="l00083"></a>00083         {
<a name="l00084"></a>00084           <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_tuple.html">Tuple</a> t = i.next();
<a name="l00085"></a>00085           <span class="comment">// Set schema of t to that of the current table</span>
<a name="l00086"></a>00086           <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_tuple.html">Tuple</a> t2 = <span class="keyword">new</span> <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_tuple.html">Tuple</a>(t);
<a name="l00087"></a>00087           t2.<a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_tuple.html#a846cbb8b648465c78633cc623caec4ee">setSchema</a>(sch);
<a name="l00088"></a>00088           tab.<a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_table.html#ac72d81075238b6f6e8406714a12156ff">put</a>(t2);
<a name="l00089"></a>00089         }
<a name="l00090"></a>00090       }
<a name="l00091"></a>00091       <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_relation_cache_iterator.html#a9b5de1deed971c99d8f8ae46a8ef789e">m_intermediateResult</a> = tab;
<a name="l00092"></a>00092     }
<a name="l00093"></a>00093   }
<a name="l00094"></a>00094 }
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